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  2. GWR 2251 Class - Wikipedia

    en.wikipedia.org/wiki/GWR_2251_Class

    Mainline released the first ready-to-run OO model in 1978. The Bachmann model was released in 1996. The Bachmann model was released in 1996. It is based on the Mainline model with revised body tooling to complement a completely new chassis design that allows the boiler backhead to be modelled.

  3. Montgomery Elevator - Wikipedia

    en.wikipedia.org/wiki/Montgomery_Elevator

    The top floor of the test tower was a conference space for the company to have meetings. Below the conference space was an experimental floor where elevator components get tested along with elevator controllers. The test tower still stands today but there are plans to demolish the tower along with the complex to build apartments. [4]

  4. Disconnector - Wikipedia

    en.wikipedia.org/wiki/Disconnector

    The disconnector is usually not intended for normal control of the circuit, but only for safety isolation. Unlike load switches and circuit breakers , disconnectors lack a mechanism for suppression of electric arcs which occur when conductors carrying high currents are mechanically interrupted.

  5. Otis Worldwide - Wikipedia

    en.wikipedia.org/wiki/Otis_Worldwide

    After a demonstration at the 1853 New York World's Fair, the elevator industry established credibility. [6] Otis elevator in Glasgow, Scotland, imported from the U.S. in 1856 for Gardner's Warehouse, the oldest cast-iron fronted building in the British Isles [7] Otis founded the Otis Elevator Company in Yonkers, New York, in 1853. When he died ...

  6. Elevator - Wikipedia

    en.wikipedia.org/wiki/Elevator

    Elevators with more than 30 m (98 ft) of travel have a system called compensation. This is a separate set of cables or a chain attached to the bottom of the counterweight and the bottom of the elevator cab. This makes it easier to control the elevator, as it compensates for the differing weight of cable between the hoist and the cab.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Digital test controller - Wikipedia

    en.wikipedia.org/wiki/Digital_test_controller

    A modern digital test controller. Digital test controllers are devices (usually computer based) that provide motion control [1] by processing digital signals. Typically a controller has inputs connected to sensors on the device they control, which measure the feedback, its current state (for example the current position), and process this signal to provide an output to a hydraulical ...

  9. Centrifugal switch - Wikipedia

    en.wikipedia.org/wiki/Centrifugal_switch

    In aircraft, a centrifugal switch is used to control the starting and ignition circuits, the governed speed indication circuit and the overspeed protection circuit of the auxiliary power unit. This switch is mounted inside a rotating body. This can be set to activate or deactivate a circuit as the rpm of device increases or decreases.